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Message-ID: <20120324164335.GA4955@lizard>
Date: Sat, 24 Mar 2012 20:43:35 +0400
From: Anton Vorontsov <anton.vorontsov@...aro.org>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>,
Russell King <linux@....linux.org.uk>,
Mike Frysinger <vapier@...too.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Richard Weinberger <richard@....at>,
Paul Mundt <lethal@...ux-sh.org>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
John Stultz <john.stultz@...aro.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
uclinux-dist-devel@...ckfin.uclinux.org,
linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
user-mode-linux-devel@...ts.sourceforge.net, linux-mm@...ck.org
Subject: Re: [PATCH 07/10] um: Should hold tasklist_lock while traversing
processes
On Sat, Mar 24, 2012 at 01:48:23PM +0100, Peter Zijlstra wrote:
> On Sat, 2012-03-24 at 14:30 +0400, Anton Vorontsov wrote:
> > Traversing the tasks requires holding tasklist_lock, otherwise it
> > is unsafe.
>
> No it doesn't, it either requires tasklist_lock or rcu_read_lock().
Well, currently the code does neither. :-)
--
Anton Vorontsov
Email: cbouatmailru@...il.com
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